It's a great serum to add to my weekly routine because it's very gentle & absorbs quickly despite its thick viscosity texture. This serum contains four different types of H.A. as well as a ceramide, so it's no surprise that my skin feels supple after using with just one layer! It's also unscented, which is a huge plus for those who dislike any scented products. So far, no irritation has occurred because it has always soothed my skin! Although the product is a little costly, it lasted a long time since you only need a small amount of it.